Introduction Routine problems in mathematics usually require one or many answers . If we are asked to find the smallest of the three consecutive integers whose sum is 18, then our answer would be 5. If we are asked to find the equation of a line passing through (2,3), we can have many answers. Proofs, however, […]

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# Monthly Archives: December 2009

## Plotting with Ivan Johansen’s Graph Software

Graph, a graphing software created by Ivan Johansen, was the first graphing software I have learned to use. Although the graphics quality is not that impressive, it has some features that are not available in other graphing software, the most notable of which is the polynomial of best-fit. The tutorial below teaches the basics of […]

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## The Exterior Angle Theorem

In the angle sum of a triangle post, we have discussed that the angle sum of a triangle is degrees. In the angle sum of a polygon post, we also have discussed that and that the angle sum of a polygon with sides is . For example, a pentagon has sides, so the sum of […]

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